Cleaned up comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@45970 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/include/clang/AST/CFG.h b/include/clang/AST/CFG.h
index fc6f682199..054358875c 100644
--- a/include/clang/AST/CFG.h
+++ b/include/clang/AST/CFG.h
@@ -284,8 +284,10 @@ private:
   // for indirect gotos
   CFGBlockListTy Blocks;
   unsigned  NumBlockIDs;
-  // opaque pointer to prevent inclusion of DenseMap.h.  Map from expressions
-  // to integers to record block-level expressions.
+  
+  // BlkExprMap - An opaque pointer to prevent inclusion of DenseMap.h.
+  //  It represents a map from Expr* to integers to record the set of 
+  //  block-level expressions and their "statement number" in the CFG.
   void*     BlkExprMap;
   
   /// BlkEdgeSet - An opaque pointer to prevent inclusion of <set>.